/Engine/Source/Runtime/PakFile/Public/IPlatformFilePak.h
Initialize and hash the CRC list then use the provided private key to encrypt the hash
void SetChunkHashesAndSign ( const [TArray](API\Runtime\Core\Containers\TArray)< TPakChunkHash > & InChunkHashes, const [TArrayView](API\Runtime\Core\Containers\TArrayView)< uint8 > & InSignatureData, const FRSAKeyHandle InKey )